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https://issues.apache.org/jira/browse/SOLR-2204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199234#comment-13199234
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Jan Høydahl commented on SOLR-2204:
-----------------------------------

Given that 3.1 was released less than a year ago, there must still be a lot of 
1.x users who have not upgraded yet.

If someone wants to refine this patch in a way that eases upgrade, both in 
terms of replication and SolrJ Streaming, I'm still positive to this. Again, 
I'm more concerned with SolrJ compat than replication compat, but you make one 
you get the other.. The hardest part will probably be sneaking the old JavaBin1 
into the code base again while Robert is alive :)
                
> Cross-version replication broken by new javabin format
> ------------------------------------------------------
>
>                 Key: SOLR-2204
>                 URL: https://issues.apache.org/jira/browse/SOLR-2204
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java)
>    Affects Versions: 3.1
>         Environment: Linux idxst0-a 2.6.18-194.3.1.el5.centos.plusxen #1 SMP 
> Wed May 19 09:59:34 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
> java version "1.6.0_20"
> Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
> Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)
>            Reporter: Shawn Heisey
>             Fix For: 3.6, 4.0
>
>         Attachments: SOLR-2204.patch, SOLR-2204.patch
>
>
> Slave server is branch_3x, revision 1027974.  Master server is 1.4.1.  
> Replication fails because of the new javabin format.
> SEVERE: Master at: http://HOST:8983/solr/live/replication is not available. 
> Index fetch failed. Exception: Invalid version or the data in not in 
> 'javabin' format
> Switching Solr's internally generated requests to XML, or adding support for 
> both javabin versions would get rid of this problem.  I do not know how to do 
> either of these things.

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